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<h2><span class="refentrytitle">Class slot_base</span></h2>
<p>boost::signals2::slot_base — Base class for slots.</p>
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<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../signals2/reference.html#header.boost.signals2.slot_base_hpp" title="Header &lt;boost/signals2/slot_base.hpp&gt;">boost/signals2/slot_base.hpp</a>&gt;

</span>
<span class="keyword">class</span> <a class="link" href="slot_base.html" title="Class slot_base">slot_base</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="emphasis"><em><span class="identifier">implementation</span><span class="special">-</span><span class="identifier">detail</span></em></span><span class="special">&gt;</span> <a name="boost.signals2.slot_base.locked_container_type"></a><span class="identifier">locked_container_type</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="slot_base.html#id-1_3_34_6_13_3_1_1_4-bb">tracking</a></span>
  <span class="keyword">bool</span> <a class="link" href="slot_base.html#id-1_3_34_6_13_3_1_1_4_1-bb"><span class="identifier">expired</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">locked_container_type</span> <a class="link" href="slot_base.html#id-1_3_34_6_13_3_1_1_4_2-bb"><span class="identifier">lock</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.34.6.14.3.4"></a><h2>Description</h2>
<p></p>
<div class="refsect2">
<a name="id-1.3.34.6.14.3.4.3"></a><h3>
<a name="id-1_3_34_6_13_3_1_1_4-bb"></a><code class="computeroutput">slot_base</code> tracking</h3>
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<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_34_6_13_3_1_1_4_1-bb"></a><span class="identifier">expired</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">true</code> if any tracked object has expired.</p></td>
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</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">locked_container_type</span> <a name="id-1_3_34_6_13_3_1_1_4_2-bb"></a><span class="identifier">lock</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<td><p><span class="term">Returns:</span></p></td>
<td>A container holding <code class="computeroutput">shared_ptr</code>s to each of the slot's tracked objects.  As long
            as the returned container is kept in scope, none of the slot's tracked objects can expire.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>
<a class="link" href="expired_slot.html" title="Class expired_slot">expired_slot</a> if any of the slot's tracked objects have expired.</td>
</tr>
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<div class="copyright-footer">Copyright © 2001-2004 Douglas Gregor<br>Copyright © 2007-2009 Frank Mori Hess<p>Distributed under the Boost
    Software License, Version 1.0. (See accompanying file
    <code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p>
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